Stoking mechanism



Dec. 25 i923.

' G. J. HAGAN STOKING MECHANISM Filed Aug. 15, 1918 5 Sheets-Sheet WEE INVENTOR Dec. 25, 1923. 1,473,515

G. J. HAGAN STOKING MECHANISM Filed Aug. 13, 1918 v 5 Sheets-Sheet 2 F'lE-Z- Dec. 25;. 1923.

G. J. HAG/KN STOKING MECHANISM Filed Aug. 13, 1913 s Sheets-Sheet 5 INVENTOH WITNESSES Dec. 25

G. J. HAGAN STO KING MECHANISM 1918 5 Sheets-Sheet 4 Filed Aug. 13

INVENTOFI III/11111 WITNESSES G. J. HAGAN STOKING MECHANISM 5 Sheets-Sheet 5 Filed Aug. 13, 1 918 UQUE INVENTOR WITNESSES @etented fies. d,

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Application and August 13, me. semi no. steers.

To all whom it may concern:

Be it known that I, Gaonea J. HAGAN, residing at Pittsburgh, in the county of Alleghen and State of Pennsylvania, a

v a citizen the United Stateahave invented or discovered certaifi newijand useful Improvements in Stokin Mechanism, of which improvements the following is a specifica tion. 10 The invention described herein relates to certain improvements in stokingmechanism especially applicable to that class or kind embodying a central retort with fuel supporting members ext-ending with a down is ward inclination from o p'osite edges ofthe retort. While some 0 the improvements claimed herein are as stated applicable generally to the type stated, other improvements are specially applicable to such stokers as employ a screw feed for forcing the coal into the central retort.

In the accompanging drawings forming a part of this speci cation Fig. 1 is a front elevation of a boiler having combinedtherewith a stoking mechanismembodying the improvements claimed. herein; Fig. 2 is a sectional plan view, the plane of section heing indicated. by the line H -Il, Fig. 1; Fig. 3 is a sectional elevation, the plane of so section being indicated by the line Hi -HI,

Fi 2; Fi 3 is a sectional view on a plane" in icated the line HI -HI Fig. 1, of the mechanism for operating the fuel feed, grate bars, etc.; Fig. 4 is a view partly in side elevation and partly in section of the mechanism for operating the grate bars and ash plate; Fig. 5 is a top plan view partly in section of a ortion of the fuel supporting members; i 6 shows in'e'levation one of the sections 0 a hollow grate bar; Fig. 7 shows in side elevation an auxilia bar in position alongside of a main bar; ig. 8 is a transverse section on a plane indicated by the line VIIIVIII, Fig. 5; Fig. 9 is an end elevation of a main orhollow bar; Fig. 10 is 'a transverse section of the same; Fig. 11 shows side and end views of a fill n piece; Fig. 12 shows in side elevation an partial section the manner of connecting the link 16 to the operating arms and Fi 13 is a detail showing the valve contro ling the flow of air to the distributing chamber.

In the practice of the invention fuel is fed from the hopper 1 into the central retort passage b means of a screw 2, the

screw being a'apted to be rotated in any suitable known form of mechanism indicated at 3. On the sheift of the screw is secured a cam 4 which is adapted to engage $0 pins 5 on the reciprocatingmember ll. This member is slotted as shown in Fig. 1 to permit of the movement of the member 6 transversely of the shaft, such movement being effected by the engagement of the W which are connected by links 12- to arms 14 on the shafts 15. The upper ends of the arms 14: are adjustably connected to links 16 which are adapted to he detachahly connected 'to pins 17 on arms 18 keyed to the shafts 19. These shafts 19 are provided with toothed sectors 20 adapted to engage teeth termed on the edges of the web 'portion 21 0f the movable grate bars 22 "l"- shaped in crosscection as shown in Figs. 5 and 8; The shafts 15 are also provided with arms 23 having their outer ends pivotall connected to the ash plates 24 as clear y shown in Fig. These ash plates have their outer edges supported on arms 25 secured to the shafts 26 which are adapted to be rotated to chan e the angular posiac tion of the dump plates by means of worms 27 enga ing toothed sectors28 secured to the she s26 outside of the furnace. In order to vary the movement of the movable rate bars 22; the connections between the inks 16 and the arms 1e are formed by blocks 29 adjustably arranged Within slots 30 in the ends of these links.

The mechanism described afiords means for imparting from the shaft of the screw for feeding coal into the furnace a reci rocation of the movable grate bars to e cot I a grogressive movement of the fuel as it is fe onto the inner ends of the to bars along the latter and also to the ash plate to efiect the movement of the ashes across the dump plate into the ash pit.

The mam grate bars 31 are made 1101- low as clearly shown in Fi 3, 5, 8, 9,'it being preferred that such 0 should are ' air'into and from the bars as hereinafter described. The front or inner ends of the bars adjacent to the retort are supported upon removable nozzles or hollow b ocks 34 which in turn rest upon the upper edges oi .the retort and the side walls of the chambers exterior to the retort and the rear ends of the bars are supported in seats formed in the upper ends of the walls 36 forming the outer. walls of air chambers on opposite sides of the median plane of the .stoking mechanisms In order to hold the front ends-of the bars 31 from lifting away from their supporting blocks, books 37 are formedon the undersides of the bars, said hooks beingladapted to extend down intothe nozzle ocks 34 and engage projections .38 on the inner walls of the nozzle blocks as; shown in Fig. 3. lhe hooks are held in engagement with such projections 33. by means of beveled projections *on the rear or outer ends of the bars fitting inside of the seats of the upper ends of the walls 36 As it will be seen by reference to Figs. 2, 3, 5 and 8, the auxiliary or "ll-shaped bars 22 rest upon adjacent main bars 31, the Webs 21 of the auxiliary bars extending down between adjacent main bars 31. In order to provide recesses for the passage of the webs 21 the outer faces of the main bars 31 are provided with laterally projecting shoulders 40 and 41 at their front or inner ends {and with shoulders 42 at their rear or outer ends, the respective shoulders on one of the main bars bearing against. corresponding shoulders on the next adjacent bars when in position in the furnace. in some cases it may be desired to provide means for breaking up the mass of coal in the retort which can be conveniently efiected by formin on the webs 21nd the auxilia bars, ngers 43 adapted on the forward reciprocation of the auxiliary bars to project into the retort. When this construction is used, the shoulders 40 and 41 are spaced a distance apart to form recesses for the guidance of these fingers43 as clearly shown in Figs. 5 and 7. It will be understood that the thickness of the shoulders 40, 41 and 42 and the webs of the T-shaped bars are so proportioned that ample spaces will be left between the webs of the .T-shapedbars and the sides of the into which the webs project for the flow of air into the fuel as hereinafter described.

In racticeit is desired that all the bars. shoul similarly constructed so as to avoid dliliculty in replacement and hence closing the central retort.

chambers under the grate surfaces.

7 this end filling pieces 44 shaped to fit Within the recessed. sides of the main bar and to project in between the spaced shoulders 40 and 41 are secured to the walls of the fur nace or may be wholly supported by the this chamber is subdivided by a brick wall and the outer walls 35 of a chamber 46 en- The chamber 46* formed by the side of the retort and the walls 35 is external of the retort and spaced therefrom. so as to form such chamber or go for air. Air is admitted through central fine 45 but is prevented by a wall 46 from flowing up around the retort into the front ends of the hollow bars and hence passed directly into the two main or receiving or supply From these chambers the air enters the rear or outer ends of the hollow grate bars through the ports 33 and flows along the same to the pews 32 at their front or inner ends from whence it flows into the air passages 46 on opposite sides of the central rert. From these passages the heated air will flow through ports 47, the'flow of air through the ports being controlled by valves 48, into the distributing boxes 49 arranged diatel under the @"atei surfaws. From these loxes the air flows up between ad jacent main and auxiliary b and is distributed laterally by the auxiliary bars 22 which have their under surfaces red. as shown in Figs. 7 and 8 for the how of air into the fuel. Openi 50 are made through the ends of the ollow bars for the flow of heated air into the fuel within the retort. While these openings may be made in any suitable manner; it is pre ferred that they should be made by notches formed in the end walls of the sections of the bars 31, the notches being so arranged in one section as to alternate .with corre sponding notches in the complementary sec tion.

It will be observed that the supply chambers are separated from the ash plate by the walls 36 so that air entering the fuel will flowfirst to the closed sup 1y chamhers and along the pges in t e bars to the front ends of the latter where: the airflow divides, part esca ing through the perforations 50 into the uel and part flowing through chambers 46* into the distributing boxes and u between the ate, bars into the fuel. ile it is believed that sufficient air for combustion of the fuel will be supplied through the passages in the imme Elli

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grae 3 adeiiisienai qnaneities sf air ean be supp ed to the fuel by opening the valve eiEGTEiGZY permitting ene air to flow frees 12 e supply enamieers directly rinse insurm preheating of the air entering the fuel or eembuseien chamben I claim herein my invention:

1. A seeking mechanism having in com binaeien a central retort, fnei. supporting members extending from eppesiee sides of the retort anci" at en angie as eke axis of the reiorfc movable ash supporting plates adjaeenfi w theends efizhe feel snppereing means for the reception of ashes, a screw for feeding fuel tie the retard; and means operative by she screw shafe for shifting the ash plate reiaeive to the fuel suppersing members to'efiect a movement 0% fine ashes aeress she ash plate.

2 A seeking mechanism having in cenr binatien a censrai retort, fuei supporting supporting means exaw eppesiiae sieles retort and at an angle 'iethe axis retere anci w. membem meveem relative 6e se ner rnernbers meveeie pier/es arranged afs the ends 0f the respect fuei sapperaiing for the reception ashes, a screw feee'iing fuei into me and means for operating" the screw and shifiing. t'che movable fuel supporting see fehe ash piase relative to the fuel g in com- 3. A mechanism havin 'binatien a reeore, fuei supporting means e rending 'frem she retort at an angle t0 the direction of movement of fuel in the rem-re, a movable ash supporting plate ecijacena t0 the enter encis of the fuel supporting means for the reception of ashes, a screw for feeding fuel into the retort ani means for rotating the screw and reciprocating the ash pieee relative to the rue supper; 5:0 afivanee ashes across the ash plate,

In temirneny whereef, I have herenn'e set my hand,

- GERGE J. HAGAN'. 

